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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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Nonlinear characteristics of induced spontaneous combustion process of sulfide ores
PAN Wei(潘伟)1, WU Chao(吴超)1, LI Zi-jun(李孜军)1, SHI Ying(石英)1, YANG Yue-ping(杨月平)2

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. School of Nuclear Resources Engineering, University of South China, Hengyang 421001, China

Abstract:To investigate the relationship between nonlinear parameters and spontaneous combustion tendency of sulfide ores, nine different sulfide ore samples were taken from a pyrite mine in China, and induced spontaneous combustion experiment was carried out in the laboratory. Different stages of the induced spontaneous combustion process were studied by integrating wavelet technology and nonlinear dynamics theory. The results show that ignition points of all the ore samples are above 330 °C, indicating that sulfide ores of the pyrite mine are difficult to combust spontaneously under normal mining conditions. Spontaneous combustion process includes three stages: incubation stage, development stage and approaching stage. The average temperature rising rate of the three stages are 1.0 °C/min, 2.0 °C/min and 4.2 °C/min, respectively. During the spontaneous combustion process, mean values of approximate entropy and correlation dimension increase at first, and then decrease in the following stage. The mean value of the maximum Lyapunov exponent increases with the passage of reaction time. In a whole, correlation among the three nonlinear parameters firstly weakens, then enhances, and the best correlation period is at approaching stage. As ignition point increases, the maximum Lyapunov exponent of approaching stage decreases. Therefore, combustible tendency of sulfide ores could be qualitatively evaluated based on the maximum Lyapunov exponent of this stage.

 

Key words: sulfide ores; induced spontaneous combustion; nonlinear parameters; ignition point; maximum Lyapunov exponent

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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